Improved machine for forming threads on screwb



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ytfnesses. Inventor.V

Forming Machines; and I do hereby declare that the an-.urgement of the gearing for driving the machine.

responding parts.

- such water as they rotate,

Vface of the rod or holt, an

N rlrritcll j ifntlnsf .'IMIPRovnD MAI-2mn ron roRMmG Tann-.sns on Ascnrrvrs.`

. ne'sensanrs rfmroa es in nme Lenen :meer ma nu in 1 To all whom it may concern:

Be it known thatI, TnsAT T. Pnosser:, of Chicago, in the county of Cook, and State of Illinois, have invented a new and useful Improvement in Screw'- following is a full, clear, and exact -description of the same, reference being had to the annexed drawings of a machine including my improvements,

Figure 1 is a plan view of said with someof the parts broken away, .to show thev interior of those parts. l t

Figure 2 is a bottom view ofthe same, showing the Figure 3 is an end elevation.

Figure 4 is a side elevation of the upon which the screw is to be formed, showing also an end view of the disk or cap, with grooves and projections for' fonning the threads.

Figure 5 is a transverse vertical section of the guide on linezzof fig.4. e

FigureI (i is a longitudinal central section on line yy of tig. 1.

Figure 7 is a plan view, partly in section.

Corresponding letters in al1 the figures refer to corguide for the rod My invention relates to machines for formingscrew threads upon bolts, or metallic bars of any kind adapted to the purpose; and

M v improvement consists ir. forming such threads by compression between plates having concentric projections upon their faces, set at an angle to one another, and revolving upon axes in different planes, and in such modifications ol'constrncliou and arrangement as will be hereinafter specifically indicated.

A, in the drawings, represents the frame of the rnachine, which rnzry be constructed as shown, or in any other suitable manner, it being provided with suitable boxes for the reception of the'slratts of the drivinggean'ng, andwith proper receptacles for the, screwforming disks or cups, and for the gears, and it may also be provided with a reservoir for water, as shown in fig. so that the screw-formingdisks may enter" and thus be kept cool, and and deliver upon the surarnonnt of water sntticieut to urusc the scale to be removed from such bolt.

B B' represent the shafts, to which are to be secured the larger gear-wheels C C, and the screw-forming disks or caps F F'.

These shafts aul fitted to and revolve in the boxes b and b', formed in or secured to the frame A, as clearly shown in figs. 1 and 6 of the drawings; the object of placing tlrcsc shafts at an angle 4to each other', as shown in lig. 1, being to throw those portionsof the sc|ew-fhrrning disks or cups which, for the time being, are opposite the point where they como in contact with and operate upon the bolt, nt such a distance at the saure time (xrrry to from each other as to permitthe full diameter-of such bolt to pass between their outer surfaces without com ing in Contact therewith, while those points which ap-V proach nearer' to eachother, may be made to penetrate thc bolt to the extent required tro form the thread n .pon such bolt. Y

The arrangement of tlrese shafts, and the screw-V fornring disks or cups which are secured thereto, shown in fig. 6 of the dnrwings, whileit diers essentially from the above, is no less important, it being such that when the bolt or bar upon which the thread isto be formed is placed in the guide G, the axis of oneof such shafts will be above the axis of such bolt, orrod,

while the axis of the other or opposite shaft will be as rnnclr below said axial line of the bolt.

The necessity tor the above-described arrangement will be apparent, when it is remembered that without it no longitudin'al movement of the rod or bolt would be caused if the centres of these shafts were placed in the same horizontall plane, as in such an event the disks or cupswould revolve without forming any screw-h thread upon auch bolt. Y

It is a well-known tiret thatthe angles of the thread upon any bolt, supposing the bolt to be placed. in a horizontal position, is in one direction upon its upper y surface, while it is in the opposite direction upon its lowersnrtiree, which fact will still further explain the necessity of placing the shafts on, may act upon that portion of the rod or bolt which is above its centre, and the other upon the opposite angles,whirlr are below such centre.

U C represent ge.'rrwheels, which are to be secured to the shafts B B', for the purpose of communicating motion' to the saure.

D D' represent pinion-gears, which, in the present case, are secured to shafts which are mounted in bearings c c', formed in the under side of the frame A, .as shown in'fig, Thesevpinions mesh with andnotarte the wheels C C', as clearly shown in the samefigure.

E E represent pulleys, which are v1o be secured to -the outer ,ends of the shafts upon which the pinio-ns D 1)' a're secured. l

On these the machine. f.

Fig. 6 shows how -these machines may bc arranged upon n table or frnne, and be driven by belts passing` down through such table, to any shaft below.

When each of -the pulleys is driven from one driving-shaft, it willfbe necessary tocross one of the belts, as it is necessary' that one of the disks or cups4 which forni the threadshould rotate in the other in theopposite direction.

'F F represent the'thread-formlng disks occupe, 1

which are to be secured to the shafts B B'. s

These disks may'be constructed in the form of plates, having a hole for-securing them to the shaft?,- and an ,attent @mit B. i .i

TREAT T. Pnoss-Errgfor C'Hr'CAGo,[Incisore-f" 7' .Lf'nm Parent 1v 91,965, ma .time 29, 1869. i

as above described, so thatone ofthe disks, or the projections formed therepulleys pass thebelts which are to drive l 'one direction, and

theirV outer edges, as shown of the concentric projections on the planation 'were made.

and it may befurnished with overhanging or projecting flange upon their edgcs, for the reception of the concentric grooves which alternate with the concentric' projections thereon, for the purpose of fon'ning the screw, or they may be made in the form of semisplreres,'as shown inthe drawings, and have the grooves and projections forrued upon in tig. L Y' These disks or cupsbeing attached to the shafts B B', it follows that the ctiects yabovev describer'l, as rcsulting from the arrangements of such shafts, in conne'ction with these disks, will be produced.

v While the revolution of the disks, arranged as set forth, would canse 'a forward feed to the har placed hetween them, this motion would he irregular; but when faces have taken hold ofthe thread, lthe concentric projecthe projections from the bar andl compressed the tions succeeding the first one, bear-ing against the sidesof the thread, will serve to the bolt, and cause itto be fed regularly forward, so as to forni a thread of a uniform pitch.

G represents the guide for the rod or bolt rrporr which the screw is to be formed. It consists of a thin control the movenrcntof piece of metal, which may be of the form shown in r the dmwings, and have the width of the diameter of the bolt to be threaded.

a slot through its centre, of

,e Upoueaclrcnd of this flattened and slotted guide l there is to be formed a tubular projection, it being fixed in place by berges formed in'or secured to frame A. Through these'hollow journals the rod or bolt t0 be threaded passes, ings.

The socket G' of the guide has cut on its inner face the thread of a female screw, of the same pitch as that to be cut on the rod or bolt. i

This screw, when it receives the thread on the bolt, serves to control Vthe movement of the latter, a fuuction which becomes essential when, in cutting tapering-pointed bolts, (as shown in tig. 7,) the innermost disks F cease to bear upon the thread which is being formed.

As the thread is raised, in part, above ,the original surface of the rod or bolt, the latter will passthrough the guide, and the threads only will engage thoseof the female screw. This raised thread is not properly shown in lig. 7, which might mislead, unless this exas shown in tig. 1 of the draw- ]rr order that the outermost of the concentric projections may act upon the rod, the edge of the disk should be bevelled, as shown.

When it is desired to fornr the threads of a given length upon a 'number of bolts or rods, a gauge-rod may be inserted into one of the hollow journals ofthe guide G, as shown in tig. 4.

The rod or bolt to be threaded is to be passed through the opposite journal, and pushed forward until its inner end cornes in contact with such gauge-rod, when the machine is to be pnt in motion, as a consequence of which, the bolt will be threaded from the point where the disks come in contact with it, to its end.

This gauge-rod may 'of any desired length to be formed, and be hehl in the gesircd posit-ion by means of a set-screw, as shown in This handle or lever is to be thrrned with. an aperture in cach oi' its ends, to receive the ends of the screws KK', it being so formed as to extend from one end of' the urachiueto the other', as Ishown in iig. 1, a guide, in which to move, and by which it rnay be held in any desired positiou, as shown in fig. 3.

f K K re resentv hollow screws which ass throu h e projections formed upon boxesb', iu'which the shafts B and B' rotate.

be setso as to allow a thread H represents a handle or lever, which is attached'V to screws, which are for a purpose soon to be described.

s op,

These screws bear against the ends of as shown in fig..( i, and are for the actuated by the handle or vlever H, thread-forming disks or cups nearer the shafts,

so as to thrcethe together, so that form the threadthereon, only a, slight indentation will be made, but so that they may be forced together gradually, until they cient distance to fonn 'a perfect thread.

Through each of these is to be secured to the `shafts B B', and is to extendbeyond the ends of screws K K', for a distance sutilcier'rt to receive a vcollar upon that portion which is outside of the handle or lever, so that: when said hanforces` the disks together, it willcause the 'screws to be turned in an opposite` direction, and thus draw the disks apart, preparatory to receiving another bolt to be threaded.

i I, in fig. 6, shows various arrangements ofbelts, which may be adopted in driving these machines.

chine is as follows:

- The parts having been constructed and arranged as shown in iig. 1, the lever or handle H being in the to be inserted into the guide G, and between the edges of the disks or cups` F F', and the machine be put in rnotiobn through'the above-described devices for that purpose, when thc handle tion shown in tig.

near each other as to form the thread upon the bolt. v As a consequence of the above arrangement ol' the disks or cups which form the threads, they will, so soon as they be threaded, cause the saure to rotate within'iits guide, and a screw-threzul corresponding to the form and pitch of the depressions and projections will beforrned, into which the project-loris nearer the inner edge of` the disks will enter, and thus cause the required longitudinal movement of the bolt or rod.

I am aware that machines for various purposes, srrclr as crushing quartz, grinding apples, grinding paints, and straightening round bars ot'ir'on, in which coucalheads orplates have been used, the tiices of 'raid however, parallel with one another, and also that in such machines the shaits one another, and that some of them have their axes screws, for adjustingthe distance between the plates.

Il do not, therefore, claim any of these features broadly, as having been first used by myself, hutlimit my claims to such modifications of construction and what inclined to one another, and at diilererrt elevations, orr axcslying in dilierentvertical and horizontal planes, substantially as set. forth.

thread is tin-mcd upon a bar' or rod, by the .compression of two disks or' cups,

jectiorrs being,

the faces ot'wrid disks being set atan other, and said disks revolving in opposite directions,

purpose ol' being when they cbrnrnence to act upon the boltor rod, to A shall penetrare the 'bolt asu- Y screwsa rod passes, which Y dle is turned in a direction opposite to thatwhiclr` The operation of my improved screw-forming maposition shown iu red lines in tig. 1,tlre bolt or rod is f Y is to he turned to the posil 1, or so far in that directionasmay l be found necessary to cause the `disks to appmach socorne iu contact with the bolt or rod to have been constructed plates, where opposed, being,l

have been set at an angle to in diti'erent planes, and that several ofthern have alsoV ,r

arrangement as adapt this machine to the mauufacanddesire to secure by Letters Pat? l Y a pair of circulardisks, each j that theircoutguous and operative faces shall be some# 2. Au improvedscrew-thrrning machine,constructed Y substantially as her-ein described, in which the spiral each having on its face con-V centric projections and grooves, the edges of said proon each disk, en the saure plane, and f angle to each upon axcsin dierent vertical and horizontal planes, equidistnnt above and below the axis of the rod or bar snhjectcd to their'zrction, substantially as ser; forth.

3. In combination with the svre thrending. disks, F F, constructed and :rr-ranged to operate substrintially :rs set forth, the guide G, lia-ving an internal tthread at G', substantially as and for the purpose set ortlr. l

4f The combination of the screw-threading disks,A

the tubular guid, and the adjustable rod placed in the lather', for regulating the length of the thread to be cut, substnutinlly as setfortlr. l

l5. The arrangement of the screws K K', handle or lever H, :ind the rods which are secured to the endl of the slmtsr carrying the thread-forming disks, in vir tue of which said disks are equally :lud simultaneously actuated, both in approaching toward and receding from each other, substantially as :md for the purpose set forth. Y Y

TREAT' T. Pnossmm f Y A 

